Abstract
Secondary anilines were first utilized in the four‐component coupling of aniline, aldehyde, alkyne, and acid to synthesize a variety of N‐substituted quinolinium salts. This method was carried out under mild reaction conditions and exhibited excellent chemo‐ and regioselectivities. DFT calculation was performed to analyze the cyclization step, where the interaction/distortion model provided better insight into the singular selectivity of terminal/internal alkynes in reaction.
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